No Skateboarding Roller Blading Or Bicycle Riding - 12 x 18 -RA Type I Engineer Grade Prismatic Reflective Sheeting by 3M, on .080 Aluminum Road Signs (For parking signs, handicapped signs, etc.)-This material will reflect at night when light hits this it, creating a road sign with superior visibility during the day and at night. The signs are .080 inch thick aluminum with engineer grade reflective sheeting applied over the surface. They will never rust and have an average lifespan of over 7 years. Superior quality resists fading.